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path: root/drivers/char/watchdog/advantechwdt.c
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Diffstat (limited to 'drivers/char/watchdog/advantechwdt.c')
-rw-r--r--drivers/char/watchdog/advantechwdt.c362
1 files changed, 0 insertions, 362 deletions
diff --git a/drivers/char/watchdog/advantechwdt.c b/drivers/char/watchdog/advantechwdt.c
deleted file mode 100644
index 8121cc247343..000000000000
--- a/drivers/char/watchdog/advantechwdt.c
+++ /dev/null
@@ -1,362 +0,0 @@
-/*
- * Advantech Single Board Computer WDT driver
- *
- * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
- *
- * Based on acquirewdt.c which is based on wdt.c.
- * Original copyright messages:
- *
- * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
- * http://www.redhat.com
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
- * warranty for any of this software. This material is provided
- * "AS-IS" and at no charge.
- *
- * (c) Copyright 1995 Alan Cox <alan@redhat.com>
- *
- * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
- * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
- *
- * 16-Oct-2002 Rob Radez <rob@osinvestor.com>
- * Clean up ioctls, clean up init + exit, add expect close support,
- * add wdt_start and wdt_stop as parameters.
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/init.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#define DRV_NAME "advantechwdt"
-#define PFX DRV_NAME ": "
-#define WATCHDOG_NAME "Advantech WDT"
-#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
-
-static struct platform_device *advwdt_platform_device; /* the watchdog platform device */
-static unsigned long advwdt_is_open;
-static char adv_expect_close;
-
-/*
- * You must set these - there is no sane way to probe for this board.
- *
- * To enable or restart, write the timeout value in seconds (1 to 63)
- * to I/O port wdt_start. To disable, read I/O port wdt_stop.
- * Both are 0x443 for most boards (tested on a PCA-6276VE-00B1), but
- * check your manual (at least the PCA-6159 seems to be different -
- * the manual says wdt_stop is 0x43, not 0x443).
- * (0x43 is also a write-only control register for the 8254 timer!)
- */
-
-static int wdt_stop = 0x443;
-module_param(wdt_stop, int, 0);
-MODULE_PARM_DESC(wdt_stop, "Advantech WDT 'stop' io port (default 0x443)");
-
-static int wdt_start = 0x443;
-module_param(wdt_start, int, 0);
-MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)");
-
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=63, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
-
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-/*
- * Watchdog Operations
- */
-
-static void
-advwdt_ping(void)
-{
- /* Write a watchdog value */
- outb_p(timeout, wdt_start);
-}
-
-static void
-advwdt_disable(void)
-{
- inb_p(wdt_stop);
-}
-
-static int
-advwdt_set_heartbeat(int t)
-{
- if ((t < 1) || (t > 63))
- return -EINVAL;
-
- timeout = t;
- return 0;
-}
-
-/*
- * /dev/watchdog handling
- */
-
-static ssize_t
-advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
-{
- if (count) {
- if (!nowayout) {
- size_t i;
-
- adv_expect_close = 0;
-
- for (i = 0; i != count; i++) {
- char c;
- if (get_user(c, buf+i))
- return -EFAULT;
- if (c == 'V')
- adv_expect_close = 42;
- }
- }
- advwdt_ping();
- }
- return count;
-}
-
-static int
-advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int new_timeout;
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = WATCHDOG_NAME,
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_KEEPALIVE:
- advwdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
- if (advwdt_set_heartbeat(new_timeout))
- return -EINVAL;
- advwdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
-
- case WDIOC_SETOPTIONS:
- {
- int options, retval = -EINVAL;
-
- if (get_user(options, p))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- advwdt_disable();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- advwdt_ping();
- retval = 0;
- }
-
- return retval;
- }
-
- default:
- return -ENOTTY;
- }
- return 0;
-}
-
-static int
-advwdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &advwdt_is_open))
- return -EBUSY;
- /*
- * Activate
- */
-
- advwdt_ping();
- return nonseekable_open(inode, file);
-}
-
-static int
-advwdt_close(struct inode *inode, struct file *file)
-{
- if (adv_expect_close == 42) {
- advwdt_disable();
- } else {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
- advwdt_ping();
- }
- clear_bit(0, &advwdt_is_open);
- adv_expect_close = 0;
- return 0;
-}
-
-/*
- * Kernel Interfaces
- */
-
-static const struct file_operations advwdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = advwdt_write,
- .ioctl = advwdt_ioctl,
- .open = advwdt_open,
- .release = advwdt_close,
-};
-
-static struct miscdevice advwdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &advwdt_fops,
-};
-
-/*
- * Init & exit routines
- */
-
-static int __devinit
-advwdt_probe(struct platform_device *dev)
-{
- int ret;
-
- if (wdt_stop != wdt_start) {
- if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- wdt_stop);
- ret = -EIO;
- goto out;
- }
- }
-
- if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- wdt_start);
- ret = -EIO;
- goto unreg_stop;
- }
-
- /* Check that the heartbeat value is within it's range ; if not reset to the default */
- if (advwdt_set_heartbeat(timeout)) {
- advwdt_set_heartbeat(WATCHDOG_TIMEOUT);
- printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
- timeout);
- }
-
- ret = misc_register(&advwdt_miscdev);
- if (ret != 0) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto unreg_regions;
- }
-
- printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
- timeout, nowayout);
-
-out:
- return ret;
-unreg_regions:
- release_region(wdt_start, 1);
-unreg_stop:
- if (wdt_stop != wdt_start)
- release_region(wdt_stop, 1);
- goto out;
-}
-
-static int __devexit
-advwdt_remove(struct platform_device *dev)
-{
- misc_deregister(&advwdt_miscdev);
- release_region(wdt_start,1);
- if(wdt_stop != wdt_start)
- release_region(wdt_stop,1);
-
- return 0;
-}
-
-static void
-advwdt_shutdown(struct platform_device *dev)
-{
- /* Turn the WDT off if we have a soft shutdown */
- advwdt_disable();
-}
-
-static struct platform_driver advwdt_driver = {
- .probe = advwdt_probe,
- .remove = __devexit_p(advwdt_remove),
- .shutdown = advwdt_shutdown,
- .driver = {
- .owner = THIS_MODULE,
- .name = DRV_NAME,
- },
-};
-
-static int __init
-advwdt_init(void)
-{
- int err;
-
- printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
-
- err = platform_driver_register(&advwdt_driver);
- if (err)
- return err;
-
- advwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
- if (IS_ERR(advwdt_platform_device)) {
- err = PTR_ERR(advwdt_platform_device);
- goto unreg_platform_driver;
- }
-
- return 0;
-
-unreg_platform_driver:
- platform_driver_unregister(&advwdt_driver);
- return err;
-}
-
-static void __exit
-advwdt_exit(void)
-{
- platform_device_unregister(advwdt_platform_device);
- platform_driver_unregister(&advwdt_driver);
- printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
-}
-
-module_init(advwdt_init);
-module_exit(advwdt_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marek Michalkiewicz <marekm@linux.org.pl>");
-MODULE_DESCRIPTION("Advantech Single Board Computer WDT driver");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);